Prologue:
So for this fanfic, I wanted to go with an idea that's been going around. The idea that if Finn felt human flesh instead of gills when Susan let him feel under her hat in the episode Beautopia, could she have been his mother? If so that would make her the only other human left and earth and she does have Finn's same blonde hair. Not to mention the cliffhanger Cartoon Network gave us which makes it a bit more suspicious. This is obviously only a very farfetched guess but I thought it would make a cute story nonetheless. Enjoy!
P.S: I have also given Susan a bit more of an advanced vocabulary for this just to avoid fussy and awkward dialogue from the way she would normally speak.
"Well you're home now." Finn told Susan watching the rest of her people run to re-habitat their previous home. Susan smiled at him. Then she took his hand, and pushed it gently under her hat. Finn gasped in surprise "Susan…" he gasped feeling the familiarity of human flesh. He gazed at her wide eyed with wonder. "Mother," Susan said. Finn looked at her confused. She grabbed his hand and held it gently in her big strong hands. "Mother," she repeated. Finn's confusion vanished. "Mother…" He repeated slowly. "You mean…? You're not my…Are you?…" Susan nodded. Finn's heart skipped a beat. "Hey buddy you ready to get going?" Jake asked coming up beside them. He noticed Finn's expression and the awkwardness in the air. "Bro?" "War kept us apart. Not safe for you." Susan continued. "What is she talking about?" Jake asked confused. "Dude?" "I couldn't keep you safe during the war." Susan said. "Eventually I lost you. I was sure I would never see you again. Certain that you had died." She began to tear up. Finn finally found his composure. "Wait, if you're saying you're my mom why did you wait so long to tell me? I mean since we first met and you figured out I was your son," Susan shook her head. "I wanted to make sure I was right." She replied. "And what makes you so sure you are?" Finn challenged. "Same blonde hair. Both humans. And your hat," she pointed to Finn's hat. "The same one I made for my baby boy." She smiled. "I recognize my own son." Finn felt his hat slowly in confusion. Looking at Susan closer, he suddenly got the feeling that he did in fact know her from somewhere long ago. "Mom…?" he gasped softly. Susan nodded tearfully but happily. "Mom!" He exclaimed happily jumping into her arms. "Mom?" Jake pondered confused. Susan held Finn tightly. Finn began to cry happily. "Wait she's your mom?" Jake asked. Susan nodded. "Mother," Susan pulled away. "Want to show you something. Come on." She said leading the boys into the city. She led them into the remains of a makeshift bedroom inside an old crumbling, building. Inside was a large bed Susan had made from soft animal skins. Finn's eyes widened as an old memory of him lying on the same bed as a baby with a woman's arms wrapped around him came back to him. Looking further into the memory, he could see that the woman was in fact Susan. But above all, he remembered feeling safe, happy, and warm. "Fish people felt sorry for me and let me and my baby stay with them." Susan explained. "What exactly happened?" Jake asked feeling the soft furs. Susan's eyes grew wide and began to water. She buried her face in her hands sobbing. "Jake," Finn scolded. He walked over and gently hugged Susan. "It's okay." He soothed. Susan looked up with a small smile. "Okay," she agreed. She picked Finn up and cradled him in her arms. She sat down on the soft furs and Jake snuggled up close putting one paw on Finn's shoe. "It all started a few years before the war," she began. Before she knew what was happening, her mind began flashing back to her old, normal life.
